At the suggestion of another member of the list I added a low pass filter to the
input of the HP5370B and I also connected the door bell transformer to an un shared branch circuit. After making these changes noise in the readings seems to have gone away. ----- Original Message ---- From: Jim Lux <[email protected]> To: [email protected] Sent: Mon, June 27, 2011 9:34:36 PM Subject: Re: [time-nuts] 60 Hz measurement party On 6/27/11 9:43 AM, Mark Spencer wrote: > I'm not sure if the results I am seeing are valid or not. My signal source > is a 16 volt doorbell transformer that feeds a voltage divider which in turn > feeds my 5370B with an approx 2 volt sine wave. Setting the trigger point on > the 5370B to 0 volts appears to provide the best results and the sine wave from > the voltage divider looks to be clean on my scope. But I'm wondering if >changes > in line voltage could be confusing things. > That's sort of why I was thinking of the sound card approach.. you sample it, fit a sinusoid, and get the zero crossing time from the parametric fit. Doorbell transformers have a lot of leakage inductance to limit the current (so that shorting the output doesn't burn it up) _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
